/ Dictionary / Index J Jovian: Meaning and Definition of Find definitions for: Jo•vi•an Pronunciation: ( jō'vē-un), [key] — adj. of or pertaining to the Roman god Jupiter. of or pertaining to the planet Jupiter. Jo•vi•an Pronunciation: ( jō'vē-un), [key] — n. a.d. 331?–364, Roman emperor 363–364. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: jovian (Thesaurus) joviality Jovian planet Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language